Rethink that question is like : 
Asking a difference between someone watering plant
VS
someone mannerlessly peeing in the bush?

When comparison(analogy) fails, intention of question looks silly..isn't it?
it seems more like to ridicule than genuinely finding answers and
yet expect to get answer to it.

Of course, if you insist, the "purpose" is the biggest difference out there in both of ours silly comparisons.

Peace :D